“…Acid (pH sensor) and bolus (impedance sensors) components were analyzed. [21][22][23][26][27][28] Acid characteristics included: (a) ARI, %, defined as the percentage of time the esophagus was exposed to acid, 2,23,24,26 (b) number of reflux events, #, 29 (c) longest reflux event, seconds, 30,31 and (d) number of symptoms. 21,22,24,26,27 Impedance characteristics included: (e) distal baseline impedance (DBI), ohms, categorized by severity (<900, 900-2000, or >2000) 23,32 and f) bolus clearance time (BCT) at Z3 and Z6, seconds, defined as the time duration of the impedance channel to drop by 50% and return to baseline.…”